Door-spring



(No Model.)

M. O. MOHR.

DOOR SPRING. No. 258,791. Patented May 30, 1882.

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UNITED STATES PATENT OFFICE.

MARTIN U. MOHR, OF MANCHESTER, IOlVA.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 258,791, dated May 30,1882.

Application filed June 30, 1881. (No model.)

To all whom it may concern Be it known that I, M. (3. Mona, ofManchester, county of Delaware, and State of Iowa, have invented new anduseful Improvements in Door-Springs; and I do hereby declare that thefollowing is a full and exact description of the same, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon.

This invention relates to that class of doorsprings in which a spiralcoil is employed, in connection with a vertical shaft or spindle; and itconsists mainly in certain details of construction relating to the upperend of the spindle and the upper bearing-bracket, by means of which thecost of production is reduced and the efficiency of the spring as. awhole is increased.

In the drawings, Figure 1 represents a front elevation of my improvedspring; Fig. 2, views of the upper end of the spindle and the upperbearing-bracket detached; Figs. 3 and 4, views of the upper end of thespindle and the coil-spring inclosing the same; and Fig. 5, a viewillustrating the manner of swinging the bracket for the purpose ofreleasing or securing the spring.

To enable others skilled in the art to make my improved spring, I willproceed to describe fully the construction of the same.

A, Fig. 2, represents .the vertical shaft or spindle, which is providedat its upper end with a pin or stud, a, cast thereon to form a solidportion of the same, an annular flange portion, to, around portion, awith transverse opening a an angular portion, a a round portion, c ofreduced diameter, and cap a, as shown.

B, Fig. 2, represents the upper bearingbracket, consisting of the plateportion 1),

with screw-opening b, Fig. 1, and the eye portion b having the angularopening b corresponding with the angular portion of the spindle, asshown, the latter being secured to the spindle by riveting the end ofthe latter, or by the use of other proper means.

0, Figs. 1 and 3, represents the spring, the upper end of which isprovided with a loop adapted to engage with the stud a of the spindle,as shown. The eye portion of the upper bracket is slipped over the endof the spindle before the cap a is secured in place.

The manner of applying the spring to the door and frame is substantiallyas follows:

The lower bearing-bracket having been rigidly secured in place, theupper bracket, which is loosely secured to the upper end of the spindleby the cap a is moved into such position that a horizontal line, 00 on,extending through the center of the plate portion I), will extend alsothrough the angular portion a of the spindle, the eye portion of thebracket at the same time encircling the round portion a above theangular portion a as shown in Fig. 5. The parts being in this position,the fastening-screw may be inserted into the opening I) and be screwednearly but not quite down to place. The spindlenow being revolved toobtain the desired tension by inserting a lever in the opening a thesame may be properly secured in place by swinging down the angular eyeportion of the bearingbracket over the angular portion of the spindleinto the position shown in dotted lines, Fig. 5, and in full lines,Fig. 1. The fastening-screw then being driven home, the spring is readyfor action.

By means of the described construction the use of the loose pins isentirely avoided, so that the spring has no part whatever which iseasily lost.

If desired, the round portion for holding the angular eye portion of thebearing-bracket, when it is desired to revolve the spindle, may belocated below the angular portion .instead of above the same, as shown.

The construction of the door-spring as a whole is very simple, and itcan be readily applied to the door and frame by an unskilled person.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

In combination with the spindle having the round and angular portion, asdescribed, the 5 bearing-bracket B, with angular portion, as described,and the cap a securing the bracket *to the spindle, as set forth,whereby by rotating the bracket or its screw the tension of the springmay be regulated as desired, substanroo tially as described.

This specification signed and witnessed this 23d day of June, 1881.

M. G. MOHR.

Witnesses:

CHAS. HUsTED, S. S. Evans.

